Press



(No Model.)

0. P. BUSHNELL.

Press.

No. 231,994. Patented Sept. 7,1880.

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N.PEIERS, PHOTO-LITHOGRAPRQR, WASHINGTON, u C.

UNITED STATES PATENT OFFICE.

OSCAR I BUSHNELL, OF WORCESTER, MASSACHUSETTS.

PRESS.

SPECIFICATION forming part of Letters Patent No. 231,994, datedSeptember '7, 1880.

Application filed April 2, 1880.

To all whom it may concern:

Be it known that T, OSCAR P. BUSHNELL, of Worcester, in the county ofWorcester and State of Massachusetts, have invented certain new anduseful Improvements in Presses 5 and I declare the following to be adescription of my said invention sufficiently full, clear, and exact toenable others skilled in the art to which it appertains to make and usethe same, reference being bad to the accompanying drawings, which form apart of this speci fication.

The object of my invention is to provide a means in knuckle-jointpresses for guiding and retaining the follower in proper relativeposition with the arms and screw, and to guard against unequal movementof said arms. I attain this object by mechanism such as is illustratedin the accompanying drawings and hereinafter described.

Figure 1 represents a front view of a kn ucklejoint press embracing myimprovements. Fig. 2 represents a horizontal section of the same at lineon 00, Fig. 1. Fig. 3 represents a vertical section of the same at liney Fig. 1.

In the drawings, A denotes the head of the press 5 B, the bolts orstandards 0, the platen or foot; D, the follower; E E, the knucklejointarms; F, the right-and-left screw, and Gthe nuts or knuckles by whichthe arms are worked on the screw. Said parts may be made substantiallyin the ordinary manner, or as shown, and need not therefore be hereinmore fully described.

Centrally of the follower D, and firmly attached to its upper side orcast thereon, I arrange a short vertical guide or ways, H, between whichworks a slide-bar, I, or equivalent guided piece, to which are pivoted,at i, swinging braces K K, which extend respectively to the right andleft knuckles G, or to the ends of the arms E E near said knucklejoints,as indicated. The ends of said braces (No model.)

K K are attached by hinges or pivots Z, so as to move inward and outwardwith the pressing-arms E E, the guide I moving up or down the way H, andforming a firm running connection with the follower, retaining thefollower and screw in central position with respect to each other, andpreventing the arms E at one side from closing more rapidly than thearms E at the opposite side, or vice versa.

The upper ends of the brace-bars K K may be pivoted on either of thehinge-bolts which secure the pressing-arms to their knuckles G, or theymay be independently pivoted to the sides of said knuckles or nuts, orto the sides of the arms above said joints. A convenient construction isto pivot them on the hingebolts lof the upper arms in the manner shownin the drawings.

A double set of brace-arms, K K, may be used, said arms being arrangedat either side of the arms E E, with the guide-piece I between theirlower ends, and the pivot-bolt i passing through from side to side, asindicated. A roll might be used in place of the sliding guidepiece I;but I prefer the construction shown. a

What I claim as of my invention, and desire to secure by Letters Patent,is-

The short .vertical guideways H, the sliding bar I, fitted to movebetween the same, and the brace-arms K K, connecting the ends of saidsliding bar with thejoints or sides of the upper pressing-arms, E E, incombination with the follower, screw, and pressing-arms in aknucklejoint press, said parts being constructed and organized foroperation as hereinbefore described.

Witness my hand this 18th day of March, A. D. 1880.

OSCAR P. BUSHNELL. Witnesses:

CHAS. H. BURLEIGH, S. R. BARTON.

